http://www.linuxidc.com/Linux/2010-10/29133.htm
Oracle 执行计划：
http://czmmiao.iteye.com/blog/1471756
http://blog.csdn.net/rulev5/article/details/6984560
http://www.jb51.net/article/30465.htm
http://www.databasejournal.com/features/oracle/article.php/3373701/Watching-SQL-Execute-on-Oracle---Part-I.htm
http://www.databasejournal.com/features/oracle/article.php/3375351/Watching-SQL-Execute-on-Oracle---Part-II.htm